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(No Model.) 2 Sheets--Shet l.

M.HIGG1NS. LOCK.

No. 491,352. Patented Feb. 7, 1893r hinteren @rares Ferner @renin MARTINHIGGINS, 0F NILES, GHIO.

LOCK.

SFECFICATION forming part of Letters Patent No. 491,352, dated February7, 1893.

Application filed February ll, 1892. Serial No. 421,213. (No model.)

To @ZZ whom it rsi/tty concern:

Beit known that I, MARTIN HIGGINS, a citizen oi the United States, and aresident of Niles, county oi Trumbull, State of Ohio, have inventedcertain new and useful Improvements in Locks, of which I herebydeclarethe following to he a full, clear, and exact description ot theinvention, such as Will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to locks, and is especially adapted to provide anonpickahle lock of simplest form, and adaptable to all usualsituations.

My invention consists in the combination and arrangement ot parts anddetails of constructiomas hereinafter described, shown in theaccompanying drawings and more specitically pointed out in the claims.

In the drawings Figure i is a view of the interior of a lock with thebottoni plate removed; Fig. 2 is a similar view with protecting plate orshield, removed from the case; Fig. 3 is a View oi" this plate detached;Fige is an eXterior view of the case; Fig. 5 is a view of the lockingholt detached; Fig. 6 is a view of the top plate of case showing thepivoted locking dog in position; Fig. 7 is an interior vien7 of a casecontaining similar mechanism; Fig. 8 is a vien1 with shield plateremoved; Fig. 9 is a view of this plate; Fig. i0 is an exterior view ofcase; Fig. li isadetailof lockingioolt; Fig. l2 is a detail of pivotedlocking dog in position; Fig. i3 is a vier;7 of the back plate of one ofthe locks. Fig. li: is a vie-W ot' keeper for door post.

In the drawings A hacioplate.

C is the lock holt as in Figs. 5 und il, provided with projectingportion C', central poris the case andB the tion C2, acted upon by thekey and rear portion 3,3 slotted at C4.

D [Figs 6 and l2] is the pivoted lockingdog, adapted to be raised in themanner of a tumbler by the key and provided with the projeoting lug d.

D is the pivot.

A springE secured to the post F, depresses the locking-dog D.

A pin G adapted to iit in the slot Gl in the heit C and guide itslongitudinal movement is firmly senin the front plate A of the oase, araised boss o serving for a hearing.

The projecting lug d on the locking-dog D is adapted to enter one v0rthe other of the recesses C5, or C in the holt C, according as the holtis forced out or withdrawn after being lifted by the key.

CIT is a thin projection adapted to iit in the Ward ot a lock, and C8 isa V shaped depression,against the sides of Which the key hears inpushing in or out the bolt.

C is a shoulder to prevent the withdrawal of the bolt from the exteriorof the case.

H. is the protecting or shield plate for the key-hole which lies betweenthe lock and hase plate and is adapted to prevent theentrancc of the keyor any picking instrumentinto the case from the exterior side ot thedoor to which the lock is attached. This plate H is provided with akey-hole Which can he made to register with the key hole in the case orcan be moved aside so as to cover the opening. It is made of hardenedsteel so that it can not he drilled or broken.

I-I is an additional holt integral with the plate II and moving with it.

h. is a pin projecting through the slot o2 in the case, by which theplate H maybe moved over or away from the key-hole.

In Fig. 3 is shown a notch 7L which is adapted to receive the lug a3upon the plate a4, pivoted on the exterior of the case at d5, the slota6 permitting the lug to pass into the case. A guiding partition a7receives and guides the holt II.

In Figs. 7 and S are shown a form of lockingbolt for the bolt IIconsisting of the locking bolt I, guided by the partition as andprovided With a pin fi', which projects through the slot o, in the case,as in Fig. i0, and is retained by the catch J pivoted at j. Thelocking-holt I passes through the partition Al at am.

The latch K at the upper portion of the lock is of any commonconstruction of door latch and is not included in this invention.

rihe keeper R shown in Fig. 1st is provided with a steel hack plate R sothat the holt can not he reached by drilling through the post, but

ifi/*hat I claim as new and desire to secure by Letters Patent is:

IOO

1. In a lock, the combination of a case A, provided with a base plate B,a locking dog pivoted to the front wall of the case, adapted to belifted by the key, a locking bolt C provided with recesses adapted to beengaged by the locking dog at the diierent positions of the bolt, one ormore thin portions on the bolt adapted to engage the Wards on the key,means 3. In a lock,a shield plate H, provided with a key-hole adapted toregister with the keyhole of the case in one position thereof,aboltintegral with the shield plate, a pin h passing through a slot in thecase and secured to the shield plate, and means for securing the plateand attached bolt in either position of its movement, comprising thelocking bolt I, partition as, slot a, stud z', and pivoted catch J,

substantially as and for the purpose set forth.

4. In combination with the pivoted and spring-actuated locking dog D,provided With lug d, the bolt C, provided with slot O4, recesses C5 andC6, thin projection C7, and V shaped depression OS and pin G upon thelock case, substantially as described.

MARTIN HIGGINS. 'Vitnesses:

WM. M. MONROE, F. H. MOORE.

